level The highest ameust of radioactivity in the area studied is on the oceatyiloor in the region of CASTLE fallcut. The BRAVO event at CASTLE. Presumably both were from Elsewhere in the lagoon, the bottom sediment generally emitted from 1500 to 4000 cpm/g coupared with a usual 1000 to 3000 cym/g in the fallout area outside the lagoon. Sampling of bottom living organisms outside the lagoon is, so far, unsuccessful. Bottom dwelling organisms in Allinginae and Bikini Lagoons (particularly the latter) were quite radioactive. Other lagoons were not studied. ‘the mclluses displayed® the highest activity and this was cutstandingly concentrated in the livers and kidneys (52,000 to 84,000 gamma crm/g). in the open sea area, measurements of currents verified he general circulation obtained at CROSSROADS and ny Japanese cruises, but more explicit information was obtained. Meander- ings and eddies dominate the flow in the latitude of Bikini; the main flow westward is located at the north side of the PPG. A large, counterclockwise-revolving eddy at Bikini is found down tc depths of at least 500 meters. The current at the surface attains 0.6 to 0.7 knot speed and averages 0.3 to 0.4% knot; thence it decreases to a maximum of 0.3 knot and average of 0.15 knot at 500 meters depth. The thickness of the wind stirred layer above the thermociine, where temperature decreases rapidiy, varies from 40 meters near Bixini to 170 meters in the northwestern part of the area. cartelsve Cant RC The ke of the lagoon emitted 45,000 cpm/g. Pet Lagoon tested 29,500 cpm/gr..; sediment from the northwest end ad top of one deep sea core taken 10 miles northwest of Bikini